| Budget Amount *help |
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
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| Research Abstract |
In this experiment, teeth with dental pulp disease, mainlyexperiencing cold water pain, have been clinically examined and bacteria has been identified from deep in the dentin of decayed teeth and dental pulp. Accordingly, the following are concluded. 1. Bacteria were isolated from the deep part of dentin in allcases examinaed. It was found that the bacteria could be carried to the canal while the pulp chamber is open. Thus the need for bacteriologic culturing of root canals before the canal is filled for all cases in which pulpectomy treatment has been applied to dental pulp desease caused by caries has been varified. 2. In all the cases wherein the number of bacterium types isolated from the canal was small, the isolated bacteria were identical to some of those detected from the deep part of dentin, which implies that dental pulp is affected by direct invasion into it by bacteria existing deep in dentin. 3. In instances where the number of bacterium types isolated from canal was large, obligate anaerobic such as Bacteroides, Fusobacterium, Prevotella and obligate anaerobic Lactobacillus, which were not isolated from the deep part of dentin, had a comparatively high ratio of isolation and the number of bacteria detected from the dental pulp proved to be large. This suggests the possibility that, at the stage when bacteria invading from the deep part of dentin multiply within the dental pulp, they change types and the percentages. 4. In case of a decayed tooth with a damp, dark-brown infected dentin, the possibility of bacteria invasion into the dental pulp to be relatively high, which can furnish a guideline for determining treatment measures
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